Seriously...
When is mirrored root disks on Linux not going to be a total disaster.
Solaris 8/9 had a shitty way with SVM until ZFS happened in 10, AIX has it pretty good since 4.x, geriatric HP-UX can even do it...
If you are insisting md is the way to go then you need to be able to clone your disk partitions and metadb equivalent easily across to diskN and encapsulate (to use the nasty Veritas term). Its Solaris 8 era half-arsed stupidity with an extra helping of utter stupidity. HP and IBM offered the LVM stuff, drag them back in to finish the job so you can mirror and use a volume manager.
If btrfs is the solution, then please, make it at least as functional as ZFS circa 2005. My experiences here suggest this is a highly immature option that given its gestation period already will never hit usable status.
Finally... distro builders, spend a little more time ensuring mirrored root installs aren't a 'sacrifice a goat' affair as to whether the bastard thing will boot or not. Ubuntu gets this mostly right once you get the shitty partitioner under control, RHEL/Centos gets it wrong, although at least the partitioner is less retarded.
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